armstrong



(No Model.)

B. J. ARMSTRONG. CRANK DISK FOR STEAM ENGINES.

No. 561,071. Patented May 26, 1896.

279.2. Fzg/ HIM 9 ANDREW 5.1;RANANi,PHOTO-LITHO.WASHINGTDN 0.0

NITED STATES PATENT OFFICE.

EDXVIN J. ARMSTRONG, OF OSW'EGO, NEW YORK, ASSIGNOR TO AMES IRON WVORKS, OF SAME PLACE.

CRANK-DISK FOR STEAM-ENGINES.

SPECIFICATION forming part of Letters Patent No. 561,071, dated May 26, 1896.

Application filed April 6, 1895. Serial No- 544=,'75'7. (No model.)

To aZZ whom it may concern.-

Be it known that I, EDWIN J. ARMSTRONG, a citizen of the United States, residing at Oswego, in the county of Oswego and State of New York, have invented certain new and useful Improvements in Crank Disks for Steam-Engines; and I do hereby declare the following to beafull, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates generally to crankdisks for steam-engines, and particularly to devices for securing the disks to the crankshaft forging; and it has for its object to provide a simple, durable, and inexpensive device for securing the crank forging and disks rigidly together and without liability of the same working loose during the operation of the engine; and it consists of the parts and combinations of parts hereinafter fully described and claimed.

In the accompanying drawings, forming a part of this specification, Figure 1 is a side elevation showing the inner face of one of my improved disks mounted on its shaft; and Fig. 2, a sectional-view taken on the line 00 00, Fig. 1.

Similar letters refer to similar parts in both the views.

A represents the shaft, B the crank-webs, and O the crank-pin, all cast or forged together in the usual or any desired manner. The shaft A is also provided with collars or hubs a, on which the disks D fit. The lower portions of the disks are enlarged or thickened, as at b, on their inner faces to form the counterbalancing-weights, and are bored out to fit the ends of the webs B of crank-pin. Great difficulty is found in securing the disks to the shaft in a permanent manner owing to the means usually employed for this purpose being inadequate to prevent working or jarring loose during the running of the engine. I provide a fastening of unusual rigidity by forming a pocket 0 in the counterweight at each side in casting the same, said pockets opening upwardly and their outer walls or bottoms conforming to the circumference of the disk, and their upper walls extending in a straight line in a diagonal direction, as best shown in dotted lines in Fig. 1. A bolt hole or opening d is formed through the upper part of the counterweight at right angles to the pockets, into which it opens, the upper end of said openings corresponding to screw-threaded openings 6 formed in the web B.

E represents the screw-bolts for securing the disks to the webs.

The disks are first adjusted to the webs and the screw-bolts E inserted through the pockets 0 and openings 01 into the openings 6 in the webs, into which they are screwed as tightly as possible. After thus securing the disks to the webs the pockets 0 are filled with molten type-metal f or other suitable metal fusing at a low heat, as shown in Fig. 1, thereby effectually preventing the bolts working loose and also restoring the symmetry and weight of the counterbalance.

Having thus described my invention, what I claimas new, and desire to secure by Letters Patent, is 

